docs: def format(self, obj, context, maxlevels, level):  # pylint: disable=arguments-differ
          """ Mask obj if it looks like an URL, then pass it to the super class.
          """
          if isinstance(obj, basestring) and "://" in fmt.to_unicode(obj):
              obj = mask_keys(obj)
          return pprint.PrettyPrinter.format(self, obj, context, maxlevels, level)